Sound-absorbing coating



, UNITED STA TE'S. PATENT oFncE.

' CLARENCE H. BRYCE, oE GLEN RIDGE, NEW JEEsEv, AssIeNoE 'ro BENJAMIN MOORE o a co, E EEooxLYN, NEW YoEK, A CORPORATION 0E NEW JEE'sEY.

SOUND-ABSORBING COATING,

No Drawing.

To all whom it may concern:

Be it known that I, CLARENCE HILL BRYCE,

a citizen of the United States, residing at No. 13 Windsor Place, Glen Ridge, in the county of Essex and- State of New Jersey, have invented a new and useful composition of matter called sound absorbing coatings to be used as a sound-absorbing coating for acoustic effects on the walls and ceilings of offices, rooms, and halls, of which the following is a specification.

The objects of my improvement are: First :-To provide means for absorbing noise and objectionable sounds in offices,

rooms and halls so that they may the less interfere with discussion and speech going on therein; I

Second :At the same timeto provide a coating that can be used on any surface or other objectionable sounds or which contain within themselves noisy conditions as from the rustling and foot shuffling of an audience, more available and comfortable 1 cussion of the occupants or otherwise,

' of gums,

' I will now stage or from the disy the sound absorbing effect ofmy improved coating on the walls and ceilings, however for speech from the ap lied l ly improved coating is composed of a liquid vehicle 'anda light gravity pigment of fine texture; the vehicle being composed such as rubberncaoutchouc, balata gum, gutta percha and the like, dissolved in benzin, naphtha, turpentine substitutes or any similar volatile "solvents, and when this:

vehicle is mixedwith the pigment, 1t must form anelastic and flexible coating that will adhere to almost any surface. The pigment shall be very fine in texture, light in gravity and have a high coefficient oflight reflection. 1

, describe 'my composition "as consisting of the preferred ingredients Specification of Letters Patent.

Patented Jline 1, mad

Application filed septem'b er 18, 1919. Serial No; 324,284.

combined in the preferable proportions and in the preferred manner ,as follows, namely 125 ,pounds of carbonate of magnesium,

and 100 gallons of vehicle.

The vehicle consists of 11 poundsof light grizzly crape rubber, and 47 gallons of volatile mineral spirits such astexene, varnolene or the like. I Y

- I The method of making is as follows: The rubber is cutinto small pieces and agitated continuously for several days with the. volatile mineral spirits until it is completely in solution. Thepigment is next mixed with this liquid by agitating in a paint-mixer and then ground through a Burr stone mill. It is then ready for use if required as a white coating or if desired it may be tinted to any shade by the-admixture of small amounts. of tinting color either dry or ground in oil,-

depending upon the shade required; If a large amount of color islrequired, it must be ground in the vehicle as a large addition of linseed or'other drying oil will harden the coating and tend to counteract the effect o-f'the same for its sound absorbing qualities.

For the best results felt fabric, which may be as much as an inch thick or may be less is applied to a plastered ceiling or to the ordinary plastered walls fastened thereto by some adhesivesubstance or otherwise, then narrow battens of wood spaced preferably from 3 to 6 feet apart are applied to the felt surface, over which is stretched a very light weight fabric, nainsopk, silk or even paper or any membranous substance leaving an air space between the fabric and the felt of about an inch; to this latter fabric'is applied my improved composition of matter in a single thin coat with a brush or by a spray or be applied, but with smaller effect my composition of matter may be applied direct to the plastered wall or direct to the thin fabric applied to the plastered wall or any, other way. It may be applied to new constructions or to existing offices and audiotherwise as'ordinary paint may toriums preventing objectionable hum and noise and echoes, and I thus realize all the foregoing objects.

lngredients or processes named but I claim I do not restrict myself to the substances,

all the known physical and chemical equivaand accenting the objections that-I remove.

With some other paints the pores of the fabric are not sufiiciently filled and dust works up into the air space and afterward works back through the fabric and hangs down in strings somewhat as it does through an unpainted fabric, disfiguring the ceiling and shaking the floor above. My coating fills the interdown on any concussion on stices' in the fabric without lessening the sound absorbing effect. It thus has sanitary values.

Instead of carbonate of magnesia, I have used diatomaceous earth with good effect and I may use with some effect any pigment of light gravity that fills the interstices. of the fabric, without excess hardening or drum-head effect, and therefore I claim such physical equivalent.

I am not aware that all the ingredients of my composition have been used together for any purpose but as an'article of manufacture, as well as a oompositionof matter for its acoustic values in absorbing objectionable sound and noise, I regard my discovery as absolutely new. I a

What I claim and desire to secure by Letters Patent is:

1. The herein described composition of matter. and article of manufacture consisting of carbonate of magnesium and a vehicle consisting of rubber and volatile spirits substantially as described and for the purpose specified.

2. The herein described composition of matter and article of manufacture for deadening sound, consisting of 125 pounds of 'carbonate of magnesium and 100 gallons:

of vehicle which consists of volatile min eral spirits and rubber in substantially the proportions of forty seven gallons of the spirits to eleven pounds of the rubber.

In witness whereof, I have hereunto set my hand at this city, county and State of New York, this 9th day of September, 1919..

CLARENCE H. BRYCE 

